It is grammatically correct to say, "The ones have ..." But in this case, it would result in an unclear sentence. Which ones? "They" has a clear antecedent: "the cars". But "the ones" introduces a new subject and never makes clear what it is referring to. In this case, do you mean "the cars that underwent a rapid change"? The ones that didn't undergo the change? Some subset of the ones that changed? Etc.